A ghostly aura emanates from the site - in part, perhaps, due to a lack of crowds. - The pyramid forms part of the archaeological zone of Xochicalco, which shimmers in heat and eerie solitude on a plateau among verdant surrounds in the southwest of the state of Morelos, 23 miles from Cuernavaca. A ghostly aura emanates from the site - in part, perhaps, due to a lack of crowds that permeate Xochicalco's more famous cousins elsewhere in Mexico.